anyway, in the event that you are just unbelievably strong....
notice most pros, who leg press quite a bit, do so after squats and sometimes leg extensions, and usually do about 20-30 reps per set. This may be your answer. Another thing that makes leg press much, much harder is if you don't lock out AT ALL during the set. No pauses at the top, no pauses at the bottom. 20 Reps of this with whatever weight you're doing is a good way to make the exercise a lot harder.